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Register a new userThe study of 80 MHz Self starting passively mode-locked Erbium-Doped Fiber Laser via nonlinear polarization rotation with SESAM
دراسة ليزر ليفي مطعم بالإربيوم بتكرارية 80 ميغاهرتز ذاتي البدء و مغلق النمط بشكل عابر (المنفعل) بالدوران اللاخطي للاستقطاب مع مرآة SESAM
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Damascus University ورقة بحثية
Publication date
2012
fields
Physics
and research's language is
العربية
Authors
فادي قمر( باحث )
Created by
Shamra Editor
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درس الليزر الليفي المطعم بالإريبوم EDFL المغلق النمط بشكل منفعل باستعمال الدوران اللاخطي للاستقطاب NPR لوحده وباستعمال الدوران اللاخطي للاستقطاب NPR مع مرآة نصف ناقلة من النوع الماص القابل للإشباع SESAM .تم الحصول على قطار من نبضة مفردة ذاتية البدء عرضها fs 114 و بمعدل تكرار (PRR) قدره MHz 80 عند استعمال طريقة غلق الأنماط المنفعلة بواسطة NPR مع EDFL طوله 55cm فقط. و تبين أن إدخال الـ SESAM في مجاوبة الليزر يؤدي إلى تقصير عرض النبضة الليزرية إلى fs 88 ، و زيادة استقرار السعة إلى 96 ،% و انخفاض الضجيج الطوري إلى نحو 26 fs .كما حصل على مدروج توافقي من الدرجة الثانية من EDFL مغلق النمط المنفعل و المستقر، ذاتي البدء بنبضات عرضها fs 248 مع استخدام SESAM في التجويف (مجاوبة) فقط. لُوحظ نظام متعدد النبضات مغلق النمط المنفعل بواسطة NPR عند زيادة طول EDFL إلى cm 80 .
Erbium-Doped Fiber Laser, EDFL, passively mode-locked via only Nonlinear Polarization Rotation, NPR, and via NPR with Semiconductor Saturable Absorber Mirror, SESAM, is studied. Self start single pulse train with pulse width of 114 fs and repetition rate (PRR) of 80 MHz has been obtained when 55 cm EDFL, passively mode-locked via NPR only. Inserting SESAM in EDFL cavity leads to shorten the pulse width up to 88 fs, increases the amplitude stability up to 96% and lower the phase noise jittering to around 26 fsec. Stable second harmonic self starting passively mode-locked EDFL with pulse width of 284 fs has also been observed only when SESAM was used in the cavity. Multi-pulsed system passively mode-locked via NPR for EDFL length of 80 cm with time difference between the successive multi-pulses ranged from few picoseconds to nanoseconds, has been observed.
References used
Grudinin, A. B. Richardson, D. J. and Payne, D. N. 1992. Energy quantisation in figure eight fibre laser, Electron. Lett. Vol 28, pp 67 - 68
Matsas, V. J. Richardson, D. J. Newson, T. P. and Payne, D. N. 1993. Characterization of a self-starting, passively mode-locked fiber ring laser that exploits nonlinear polarization evolution”, Opt. Lett., Vol.18, pp.358- 360
Nakazawa, M. Yoshida, E. Sugawa T. and Kimura, Y. 1993. Continuum suppressed, uniformly repetitive 136fs pulse generation from an erbium doped fiber laser with nonlinear polarization rotation”, Electron. Lett., vol. 29, pp. 1327-1329
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